G223 Read/Write Driver

Summary The G223 module is a component used in the PDP-15 computer system, designed to provide read and write drive currents for the X and Y planes of a 4K memory stack. Each module contains two drivers that operate in conjunction with G222 modules to establish current paths through the core memory.

Key technical details include:

• Operational Mechanism: Each driver utilizes two input control NAND gates and two current switches connected in series to route current from ground to -24V, utilizing a balun network to maintain current equality.
• Input/Output Specifications: The module presents 2.5 unit loads for READ and WRITE inputs.
• Performance Metrics: The system operates on an 800 ns memory cycle time. It features a current-rise time of approximately 100 ns, a fall time of 40 ns, and a stagger time (Ts) between read and write currents of approximately 130 ns.